<script setup>
import { userRegisterService,userLoginService } from '@/api/user.js'
import { User, Lock } from '@element-plus/icons-vue'
import { ElMessage } from 'element-plus'
import { ref, watch } from 'vue'
import { useUserStore } from '@/stores'
import { useRouter } from 'vue-router'

//控制注册与登录表单的显示， 默认显示注册
const isRegister = ref(false)
const form = ref()
const router = useRouter()
// 用于提交的form数据对象
const formModel = ref({
    username: '',
    password: '',
    repassword: ''
})
// 用于表单验证的规则
// 1.非空校验 required: true, message 消息提示  trigger 触发时机 blur change
// 2.长度校验 min max message trigger
// 3.正则校验 pattern 正则规则 message trigger
// 4.自定义校验 => 自己写逻辑校验（校验函数）
//      validator(rule, value, callback) 
//      (1)rule: 当前校验规则的相关信息
//      (2)value: 所校验的表单元素目前的表单值
//      (3)callback: 校验成功回调函数 => () => {},
//                   校验失败回调函数 => (err) => {}

const rules = ref({
    username: [
        { required: true, message: '请输入用户名', trigger: 'blur' },
        { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
    ],
    password: [
        { required: true, message: '请输入密码', trigger: 'blur' },
        { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur'},
        { pattern: /^[a-zA-Z0-9]{6,15}$/, message: '密码由6-15位数字和字母组成' , trigger: 'blur' }
    ],
    repassword: [
        { required: true, message: '请再次输入密码', trigger: 'blur' },
        { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur'},
        {
            validator(rule, value, callback)  {
                // 判断两次输入的密码是否一致
                if (value !== formModel.value.password) {
                    callback(new Error('两次输入密码不一致!'));
                } else {
                    callback();
                }
            }, trigger: 'blur'
        }
    ]
})

const register = async () => {
    // 注册成功之前，先进行校验，校验成功 -》 请求，校验失败-》自动提示
    await form.value.validate()
    console.log('开始注册请求')
    await userRegisterService(formModel.value)
    ElMessage.success('注册成功')
    isRegister.value = false
}
const userStore = useUserStore()
const login = async () => {
    // 注册成功之前，先进行校验，校验成功 -》 请求，校验失败-》自动提示
    await form.value.validate()
    console.log('开始登录请求')
    const res = await userLoginService(formModel.value)
    console.log(res)
    userStore.setToken(res.data.token)
    router.push('/')
}



//切换的时候重置表单内容
watch(isRegister, () => {
    // form.value.resetFields()
    formModel.value = {
        username: '',
        password: '',
        repassword: ''
    }
})
</script>
<template>  

    <!-- 
    1.结构相关
     el-row 表示一行 一行分为24份
     el-col 表示一列
     (1) :span="12" 表示占12份
     (2) :offset="3" 表示偏移3份
     (3) class="bg" 表示背景图片

     el-form 表示一个表单
     el-form-item 表示表单的一行
     el-input 表示输入框
    2.校验规则
        (1) el-form => :model="ruleForm"   绑定的整个form的数据对象{username:'',password:''}
        (2) el-form => :rules="rules"      绑定的整个rules的规则对象{username:[],password:[]}
        (3) 表单元素 => v-model="ruleForm.username"  绑定form的数据对象中的username属性
        (4) el-form-item => prop 配置生效的是哪个校验规则(和rules中的字段要对应)
      -->
    <el-row class="login-page">

        <el-col :span="12" class="bg"></el-col>
        <el-col :span="6" :offset="3" class="form">
            <!-- 注册表单 -->
            <el-form :model="formModel" :rules="rules" ref="form" size="large" autocomplete="off" v-if="isRegister">
                <el-form-item>
                    <h1>注册</h1>
                </el-form-item>
                <el-form-item prop = "username">
                    <el-input v-model="formModel.username" :prefix-icon="User" placeholder="请输入用户名"></el-input>
                </el-form-item>
                <el-form-item prop = "password">
                    <el-input v-model="formModel.password" :prefix-icon="Lock" type="password" placeholder="请输入密码"></el-input>
                </el-form-item>
                <el-form-item prop = "repassword">
                    <el-input v-model="formModel.repassword" :prefix-icon="Lock" type="password" placeholder="请输入再次密码"></el-input>
                </el-form-item>
                <!-- 注册按钮 -->
                <el-form-item>
                    <el-button @click="register" class="button" type="primary" auto-insert-space>
                        注册
                    </el-button>
                </el-form-item>
                <el-form-item class="flex">
                    <el-link type="info" :underline="false" @click="isRegister = false">
                        ← 返回
                    </el-link>
                </el-form-item>
            </el-form>
            <!-- 登录表单 -->
            <el-form :model="formModel" :rules="rules" ref="form" size="large" autocomplete="off" v-else>
                <el-form-item>
                    <h1>登录</h1>
                </el-form-item>
                <el-form-item prop="username">
                    <el-input v-model="formModel.username" :prefix-icon="User" placeholder="请输入用户名"></el-input>
                </el-form-item>
                <el-form-item prop="password">
                    <el-input v-model="formModel.password" name="password" :prefix-icon="Lock" type="password" placeholder="请输入密码"></el-input>
                </el-form-item>
                <el-form-item class="flex">
                    <div class="flex">
                        <el-checkbox>记住我</el-checkbox>
                        <el-link type="primary" :underline="false">忘记密码？</el-link>
                    </div>
                </el-form-item>
                <!-- 登录按钮 -->
                <el-form-item>
                    <el-button @click="login" class="button" type="primary" auto-insert-space>登录</el-button>
                </el-form-item>
                <el-form-item class="flex">
                    <el-link type="info" :underline="false" @click="isRegister = true">
                        注册 →
                    </el-link>
                </el-form-item>
            </el-form>
        </el-col>
    </el-row>
</template>

<style lang="scss" scoped>
/* 样式 */
.login-page {
    height: 100vh;
    background-color: #fff;

    .bg {
        background: url('@/assets/logo2.png') no-repeat 60% center / 240px auto,
            url('@/assets/login_bg.jpg') no-repeat center / cover;
        border-radius: 0 20px 20px 0;
    }

    .form {
        display: flex;
        flex-direction: column;
        justify-content: center;
        user-select: none;

        .title {
            margin: 0 auto;
        }

        .button {
            width: 100%;
        }

        .flex {
            width: 100%;
            display: flex;
            justify-content: space-between;
        }
    }
}
</style>
